SimpleAdcStream.ino

For Arduino Due

Simple ADC capturing Example:

This example demonstrates how to capture a steady stream of ADC data

See AnalogAudio_config.h to change the MAX_BUFFER_SIZE allowing larger chunks

/*
    AutoAnalogAudio streaming via DAC & ADC by TMRh20
    Copyright (C) 2016  TMRh20 - tmrh20@gmail.com, github.com/TMRh20
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
  Auto Analog Audio (Automatic DAC, ADC & Timer) library
 
  Features:
  1. Very simple user interface to Arduino DUE DAC and ADC
  2. PCM/WAV Audio/Analog Data playback using Arduino Due DAC
  3. PCM/WAV Audio/Analog Data recording using Arduino Due ADC
  4. Onboard timers drive the DAC & ADC automatically
  5. Automatic sample rate/timer adjustment based on rate of user-driven data requests/input
  6. Uses DMA (Direct Memory Access) to buffer DAC & ADC data
 
  Auto Analog Audio Library Information:
  http://github.com/TMRh20
  http://tmrh20.blogspot.com
 
  Simple ADC Sampling
 
  Sample the ADC in chunks of 32-bytes at a defined sample rate
  See AnalogAudio_config.h to change the MAX_BUFFER_SIZE allowing larger chunks
*/
 
 
#include <AutoAnalogAudio.h>
 
AutoAnalog aaAudio;
 
/*********************************************************/
 
void setup() {
 
  pinMode(A3, OUTPUT);
  digitalWrite(A3, HIGH);
 
  Serial.begin(115200);
  Serial.println("Analog Audio Begin");
 
  aaAudio.begin(1, 0);              //Setup aaAudio using ADC only
  aaAudio.autoAdjust = 0;           //Disable auto adjust of timers
  aaAudio.adcBitsPerSample = 12;    //Sample at 12-bits
  aaAudio.setSampleRate(32);        //Get 32 samples every second
 
  //Start loading ADC buffers
  aaAudio.getADC(32);
}
 
/*********************************************************/
 
void loop() {
 
  // Get 32 samples from the ADC at the sample rate defined above
  // Note: This function only blocks if the ADC is currently sampling and autoAdjust is set to 0
  // As long as any additional code completes before the ADC is finished sampling, a continuous stream of ADC data
  // at the defined sample rate will be available
  aaAudio.getADC(32);
 
  // Sum all the samples into a float
  float allSamples = 0.0;
  for (int i = 0; i < 32; i++) {
    allSamples += aaAudio.adcBuffer16[i];
  }
 
  // Divide the total by the number of samples
  allSamples /= 32.0;
 
  // This will print every second at a sample rate of 32 samples/second
  Serial.print("Samples Total Value / Number of Samples == ");
  Serial.println(allSamples);
 
}
 
/*********************************************************/